Consolidated Statement of Earnings (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Property and casualty insurance net earned premiums	$ 3,878	$ 3,204	$ 2,847
Life, accident and health net earned premiums	108afg_LifeAccidentAndHealthPremiums	114afg_LifeAccidentAndHealthPremiums	318afg_LifeAccidentAndHealthPremiums
Net investment income	1,501us-gaap_NetInvestmentIncome	1,346us-gaap_NetInvestmentIncome	1,301us-gaap_NetInvestmentIncome
Realized gains (losses) on:
Securities	52	221	210
Subsidiaries	0afg_RealizedGainsLossesOnSubsidiaries	(4)afg_RealizedGainsLossesOnSubsidiaries	161afg_RealizedGainsLossesOnSubsidiaries
Income (loss) of managed investment entities:
Investment income	116	128	125
Loss on change in fair value of assets/liabilities	(44)	(14)	(94)
Other income	102us-gaap_OtherIncome	97us-gaap_OtherIncome	89us-gaap_OtherIncome
Total revenues	5,713us-gaap_Revenues	5,092us-gaap_Revenues	4,957us-gaap_Revenues
Costs and Expenses:
Property and casualty insurance: Losses and loss adjustment expenses	2,494	2,040	1,873
Property and casualty insurance: Commissions and other underwriting expenses	1,172	1,019	887
Annuity benefits	648afg_AnnuityBenefits	531afg_AnnuityBenefits	541afg_AnnuityBenefits
Life, accident and health benefits	164afg_LifeAccidentAndHealthBenefits	160afg_LifeAccidentAndHealthBenefits	356afg_LifeAccidentAndHealthBenefits
Annuity and supplemental insurance acquisition expenses	173	167	282
Interest charges on borrowed money	73us-gaap_InterestExpense	71us-gaap_InterestExpense	75us-gaap_InterestExpense
Expenses of managed investment entities	82afg_ExpensesOfManagedInvestmentEntities	89afg_ExpensesOfManagedInvestmentEntities	80afg_ExpensesOfManagedInvestmentEntities
Other expenses	281us-gaap_OtherCostAndExpenseOperating	326us-gaap_OtherCostAndExpenseOperating	326us-gaap_OtherCostAndExpenseOperating
Total costs and expenses	5,087us-gaap_BenefitsLossesAndExpenses	4,403us-gaap_BenefitsLossesAndExpenses	4,420us-gaap_BenefitsLossesAndExpenses
Earnings before income taxes	626us-gaap_OperatingIncomeLoss	689us-gaap_OperatingIncomeLoss	537us-gaap_OperatingIncomeLoss
Provision for income taxes	220us-gaap_IncomeTaxExpenseBenefit	236us-gaap_IncomeTaxExpenseBenefit	135us-gaap_IncomeTaxExpenseBenefit
Net earnings, including noncontrolling interests	406us-gaap_ProfitLoss	453us-gaap_ProfitLoss	402us-gaap_ProfitLoss
Less: Net earnings (loss) attributable to noncontrolling interests	(46)	(18)	(86)
Net Earnings Attributable to Shareholders	452us-gaap_NetIncomeLoss	471us-gaap_NetIncomeLoss	488us-gaap_NetIncomeLoss
Earnings Attributable to Shareholders per Common Share:
Basic (USD per share)	$ 5.07us-gaap_EarningsPerShareBasic	$ 5.27us-gaap_EarningsPerShareBasic	$ 5.18us-gaap_EarningsPerShareBasic
Diluted (USD per share)	$ 4.97us-gaap_EarningsPerShareDiluted	$ 5.16us-gaap_EarningsPerShareDiluted	$ 5.09us-gaap_EarningsPerShareDiluted
Average number of Common Shares:
Basic (shares)	89.0	89.3	94.2
Diluted (shares)	91.0	91.2	95.9
Cash dividends per Common Share (USD per share)	$ 1.91	$ 1.805	$ 0.97
Supplemental disclosure of Realized gains (losses) on securities:
Realized gains before impairments	88	233	236
Losses on securities with impairment	(36)us-gaap_ImpairmentOfInvestments	(14)us-gaap_ImpairmentOfInvestments	(27)us-gaap_ImpairmentOfInvestments
Non-credit portion recognized in other comprehensive income (loss)	0	2	1
Impairment charges recognized in earnings	(36)	(12)	(26)
Total realized gains on securities	$ 52	$ 221	$ 210

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of property and casualty premiums earned.

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